guys, ive put the BOVS in, no matter how tight i tighten the adjustment bolt (bottoming out on lock nut) the bitch is still opening at idle and off boost has anyone installed one of these things yet, anyone experienced the same problems.. i figured maybe the bolt need to be loosened, but that just seems to make things worse James, have you test driven the BOVS yet? theres no leaks and idle is peffect if i disconnect the vacuume hose to the bovs (both), so its isnt the adapters or plugs that are leaking i'm annoyed as i'll have to miss the Perth cruise now as i havent had a chance to fix my exhaust leak as i have been dicking with these stupid bovs all arvo i'm thinking io might need to do this bov controller
Sounds like the spring is to weak it shouldnt flutter or move at all at idle. you can buy other heavier springs if nessesary if thats what the problem is.
BOV's.. are supposed to be open off boost and at idle... when you get off the throttle, they open to relaease pressure.. the springs in my GB Recircs were way too strong, and had to shorten them and re temper them..
mmm If they're the HKS style ones, well I've got originals if you want to compare or something. I'm gonna go to the meet point which isn't far away but not the cruise, will be home after that.
Re: BOV's.. you must be crazy.. if the bovs are open at idle, they will be letting air into the system unmetered. which is why my car is now running like a dog off boost. i might take you up on that mike the GB bovs arent recircs
I'm back.. gonna be farting around at home for most the day, if I go out it won't be for long so you can drop in whenever you like, I'd go down there but am a bit paranoid bout the low fuel pressure. We could put your BOV in my Z or something if you can't drive yours as it is.
Re: Can someone who has these working tell me if they sound like HKS SSQV? sorry mike, didnt get down there tdoay.. i'll drop past unexpectedly sometime during the week.. haha i'll call ya.. i didnt even open the garage door today..
pssshhhhtttttt!!!!!!!! Undo and remove the nut on the back then screw the bolt all the way down. Easy fix:thumbsup: I had to do the same on my 180sx. On my mates r33 we needed a longer bolt. James. :zlove:
Recirc GB.. bring it on.... ok.. The Previous GB valves are Re-circs.. Re-circs should be open at idle, and they can be as the metered air is still in the system as it was designed to be.. if your running Free to air BOV's the spring pressure has to be higher to hold the valves closed at idle, the recircs have the benifit of being open more of the time alowing the turbos to spool freely under less load.. and all the metered air that has passed through your air flow meter stays in the system, I would have thought it was a better system, rather than dumping metered air out of the system and the Engine management adding fuel for that air, causing rich mixtures... but each to their own.. some people like the wanky pachew sound.. and hey even the na lancer and exel drivers can buy electric BOV's... lmao :LOL:
Correct.......... A small slip on name definition in your first post Draco, but the info was correct. What Draco is saying in his 2nd post is 100% correct. I had a read of the article in the magazine about putting an electronic control kit on to help control the blow off valves - yeah right!!! Why would you bother? A whole lotta bull to achieve nothing different than you would have if you had set up your valves correctly. Interesting point to note about the article: Even they don't get the naming convention correct insome of their diagrams - they show valves perfoming recirc functions and call them blow offs..... Anyhoo.... the whole exercise is to ensure that blow-offs (what they are called when venting to atmosphere)stay shut at idle. If you want, use a vacuum gauge and gun for this - measure how much vacuum your engine draws up at idle when first started cold, then how much vacuum it has when hot idling. Choose the highest vacuum reading. Now, use the vacuum gun and draw up a vacuum on the control diaphragm which is 5mmHg higher than the highest vacuum drawn up by the motor. You should now be setting your valve to just be opening under this situation - this will ensure the valve is shut under all idle and boost conditions, but will be open under throttle lift off conditions. Ensure both valves operate with the same numbers. Or of course, you could use a bit higher level of engineering and use a factory recirc style of system - optimised for pressure control. If you set a recirc system up correctly ( on an MAF metered engine ) it wil always provide more consistent metering and control than a blow off system and not have that annoying "my motor has a cold - listen to it sneeze" syndrome. The aim with recirc valves is to have them fully open at idle thereby allowing the turbos to freewheel at a higher rpm at idle - thereby providing snappier spool times. I usually set them so that they are open around the -10mmHg mark. Idle should draw up at least -40mmHg, so you can see that even the slightest lift off of throttle causing a positive pressure on the compressor wheel (and thereby stalling it unnecessarily) is controlled in an efficient fashion - minimising compressor wheel speed losses on a gear change or throttle lift offs for cornering etc.... Anyway - it's your choice as to BOV's or Recirc's - personally I would be going for Recircs......
Re: Correct.......... i'm not one for wank factor usually.. BOVs dont really hurt performance all that much and the volume of air they dump is very minimal.. its my furst turbo car and i want to hear her sneeze.. :thumbsup::thumbsup: thats what i was gunna try first james.. i was planning on ripping em open first to see how much i could squeeze the spring with the bolt.. cheers
Re: Correct.......... ok, ive put a bolt in one thats about 10mm longer than stock.. and the other one has the stock bolt wound all the way in with no lock nut.. erratic idle is gone.. but one is louder than the other.. i'm thinking the one with the 10mm long bolt need one slightly shorter.. there must be a better way of doing this though.. it seems at normal idle my car is pulling -20inHg (according to my autometer boost guage) and at gear change it only goes down to -22inHg with gearing down going down to around 21inHg.. i'm guessing the guage isnt fast enough to show gear change as i'm sure that it isnt that close i'm gunna go the BOV controller route just to make sure shes opening when i want and closed when i want, and put a cool little BOV LED on the dash to know when she opening that way i can loosen the spring off and have them working properly as for the noise.. hard to explain.. umm... sika-shhhhhh hehe :thumbsup::thumbsup::thumbsup: oh and for the guy who was talking bad things about autospeed.. the story is to turn factory recircs into BOVS, and they get the terms right.. dont knock it till you've tried it
Minivac.. is a small hand operated vacuum pump with a gauge on it, they are expensive.. "oh and for the guy who was talking bad things about autospeed.. the story is to turn factory recircs into BOVS, and they get the terms right.. dont knock it till you've tried it" and shyte like this is just a slanging match, he can knock it, he's tried BOV's Re-circs, and set up countless systems others couldn't sort out on Zeds and GTR's, there has been advice given why a Recirc system works and the disadvantages of free to air systems.
Re: Minivac.. recircs are still bovs, they call them bovs the whole way through the article. i dont like pointless slanging matches and his comments were not constructive, correct two wrongs dont make a right and i appologise for lowering myself to that level. does anyone here in perth have facilities to setup bovs correctly otherwise i'll have to buy a vacuum pump (unless they are more expensive than brand name BOVs) but small compressors are cheap and 50mmHg is not a lot of pressure (like 1 PSI) these cheap GB BOVS work.. but they arent consistent and the approach of wind one in as much as the other will not work as they arent consistent..
Re: Wooksta.. yeah thatd be right. open my big fat mouth.. haha ok i dont want to get into a discussion of what is better recirc or vent to air.. they are still blow off valves and when i said dont knock it till youve tried it i meant electronic control, not free to air.. anyways, one thing ive noted that is bad about autospeeds article is that, if the bovs are open at idle (the problem you are trying to fix with such a device) then if you get off the gas under vacuum, the bovs will still open when they shouldn't i like it in that the spring can be soft so open the valve wide open faster than the brutal method of tightening the preload on the spring.. this just makes the piston close faster aswell not venting as much gas.
